I just finished a 500km ( 300 mile) round trip, all done with cruise set at the speed limit ( 68mph) truck shows 10. 3 l/100kms ( 27. 4 mpg imp, 23mpg US) I find the EVIC display to be close to hand calculated when averaged over a long period, so I'm pleased with this mileage. Wonder what it would get at 55mph ? ( I'll never know)